Xianyin Xin commented on YARN-3931:

This reminds me an earlier trouble i have met. Hi [~Naganarasimha], can we 
consider to remove the "" node label expression in the code? It seems not make 
sense we set a node label as "". For node label expression, it should be 
"some_label" or null. 

Just an unrigorous thoughts, what do you think?

> default-node-label-expression doesn’t apply when an application is submitted 
> by RM rest api
> -------------------------------------------------------------------------------------------
>                 Key: YARN-3931
>                 URL: https://issues.apache.org/jira/browse/YARN-3931
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>         Environment: hadoop-2.6.0
>            Reporter: kyungwan nam
>            Assignee: kyungwan nam
>         Attachments: YARN-3931.001.patch
> * 
> yarn.scheduler.capacity.<queue-path>.default-node-label-expression=large_disk
> * submit an application using rest api without "app-node-label-expression”, 
> "am-container-node-label-expression”
> * RM doesn’t allocate containers to the hosts associated with large_disk node 
> label

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